Were we happier in the stone age?

We are far more powerful than our ancestors, but are we much happier? Historians seldom stop to ponder this question, yet ultimately, isn't it what history is all about? Our understanding and our judgment of, say, the worldwide spread of monotheistic religion surely depends on whether we conclude that it raised or lowered global happiness levels. And if the spread of monotheism had no noticeable impact on global happiness, what difference did it make?
Read more: https://www.theguardian.com/books/2014/sep/05/were-we-happier-in-the-stone-age?source=Snapzu